Date formatter doesn't work on certain iOS Devices

Question

A problem has arisen with my program in which it crashes on some specific devices. I've managed to track the problem to a dateFormatter being nil when trying to convert a string to a date. This is only only some devices however.

My question is, how is this possible and is there a problem with how I format my date?

    func checkIfActive(start: String, end: String) -> Bool
{

    let dateFormatterPrint = DateFormatter()
    dateFormatterPrint.dateFormat = "MMMM dd,yyyy hh:mma"


    let dateStart = dateFormatterPrint.date(from: start)
    let dateEnd = dateFormatterPrint.date(from: end)

    print("start time string\(start)") // This print March 19,2018 08:33PM
    print("start date\(dateStart)") // This is nil some devices, however works fine on others



        if(Date().isBetween(date: dateStart!, andDate: dateEnd!))
        {
            return true
        }

    return false
}

@Xcoder Thats the thing. The devices can be the same as others and still act differently. For example I tested 2 iPhone 6s with iOS 11.2.5 and only one crashes here ever. — madmanprogram, Mar 19 '18 at 22:10
Perhaps this https://stackoverflow.com/questions/40692378/dateformatter-doesnt-return-date-for-hhmmss ? — Martin R, Mar 19 '18 at 22:11
Check locale. You need to find the differences between your devices. — stevenpcurtis, Mar 20 '18 at 02:20

score 3 · Answer 1 · answered Oct 11 '18 at 15:09

3

I've had this issue a couple of times, only on an iPhone 8.

To fix it you just need to give the DateFormatter a locale, e.g.:

dateFormatterPrint.locale = Locale(identifier: "en_US_POSIX")

answered Oct 11 '18 at 15:09

Leon

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Date formatter doesn't work on certain iOS Devices

1 Answers1